eh, lots of people I know started on 600cc and liter bikes and they're doin fine. It's a person to person basis. Some people are "mature" enough and some aren't.
if you've put 10,000 miles on your bike and really still can't control it well, motorcycles just aren't for you and you really need to get rid of the bike before you die on it. I'm guessin you were just bein funny though
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Always get a second opinion because most of these people are makin' this stuff up